How the Mentioned CVE Works:
The vulnerability arises when a CDN (Content Delivery Network) in front of a Nuxt.js application fails to consider the query string when caching HTTP responses. An attacker can craft a malicious HTTP request, such as `https://mysite.com/?/_payload.json`, which forces the server to return a JSON response. If the CDN caches this response without validating the query string, subsequent requests to the same URL (even without the query string) will receive the cached JSON response. This can lead to cache poisoning, where malicious or unintended content is served to users, severely impacting site availability and functionality. The attacker can further automate this process to continuously poison the cache, rendering the site permanently unavailable.
DailyCVE Form:
Platform: Nuxt.js
Version: All versions
Vulnerability: Cache Poisoning
Severity: Critical
Date: 2024-XX-XX
What Undercode Say:
Exploitation:
1. Craft Malicious Request:
curl -X GET "https://vulnerable-site.com/?/_payload.json"
2. Automate Cache Poisoning:
Use a script to send requests at intervals matching the cache duration:
import requests
import time
while True:
requests.get("https://vulnerable-site.com/?/_payload.json")
time.sleep(CACHE_DURATION)
Protection:
1. CDN Configuration:
Ensure the CDN considers query strings when caching responses. For example, in Cloudflare:
– Navigate to Caching > Configuration > Cache Key.
– Enable “Include Query String” in cache key settings.
2. Nuxt.js Server-Side Validation:
Add middleware to validate and sanitize query strings:
export default function ({ query, redirect }) {
if (query._payload) {
return redirect('/error');
}
}
3. Cache-Control Headers:
Configure `Cache-Control` headers to prevent caching of dynamic content:
export default {
serverMiddleware: [
{
path: '/',
handler: (req, res, next) => {
res.setHeader('Cache-Control', 'no-store');
next();
}
}
]
};
4. Rate Limiting:
Implement rate limiting to prevent automated attacks:
npm install express-rate-limit
const rateLimit = require('express-rate-limit');
const limiter = rateLimit({
windowMs: 15 60 1000, // 15 minutes
max: 100 // limit each IP to 100 requests per windowMs
});
app.use(limiter);
5. Monitoring and Logging:
Set up monitoring to detect unusual traffic patterns:
npm install morgan
const morgan = require('morgan');
app.use(morgan('combined'));
6. Patch Management:
Regularly update Nuxt.js and CDN configurations to address known vulnerabilities.
By implementing these measures, you can mitigate the risk of cache poisoning and ensure the availability and integrity of your Nuxt.js application.
References:
Reported By: https://github.com/advisories/GHSA-jvhm-gjrh-3h93
Extra Source Hub:
Undercode
